Reading this thread has piqued my interest in a M/C dedicated GPS, so I had a look at the Zumos including the 390, 590 etc. I found the graphics really disappointing, they reminded me of something from Game Machines in the 80's. I was expecting 'Pub Pong' to be an option for those rain delays. I'll stick with a map and my memory....while it holds out.
I'd really expect something a bit more cutting edge considering the price they charge.